Merge #21491: test: remove duplicate assertions in util_tests

7e3444805e test: remove duplicate assertions in util_tests (Jon Atack)

Pull request description:

  as noticed by Kiminuo in https://github.com/bitcoin/bitcoin/pull/21488#discussion_r598247676

ACKs for top commit:
  practicalswift:
    cr ACK 7e3444805ed747db819d7bf630feafc31783e5de: patch looks correct
  vasild:
    ACK 7e3444805e

Tree-SHA512: ad3d5983ad3a665155d766843dfda7178ced47e82154838331e428ed0828a467c1cf4bf99270aaf191e94156d485fafd0a7d5bc68248c4c1304a00ca5a2a9d2e

src/test/util_tests.cpp

@@ -1450,7 +1450,6 @@ BOOST_AUTO_TEST_CASE(test_ParseInt32)
     BOOST_CHECK(!ParseInt32("1a", &n));
     BOOST_CHECK(!ParseInt32("aap", &n));
     BOOST_CHECK(!ParseInt32("0x1", &n)); // no hex
-    BOOST_CHECK(!ParseInt32("0x1", &n)); // no hex
     BOOST_CHECK(!ParseInt32(STRING_WITH_EMBEDDED_NULL_CHAR, &n));
     // Overflow and underflow
     BOOST_CHECK(!ParseInt32("-2147483649", nullptr));
@@ -1513,7 +1512,6 @@ BOOST_AUTO_TEST_CASE(test_ParseUInt8)
     BOOST_CHECK(!ParseUInt8("1a", &n));
     BOOST_CHECK(!ParseUInt8("aap", &n));
     BOOST_CHECK(!ParseUInt8("0x1", &n)); // no hex
-    BOOST_CHECK(!ParseUInt8("0x1", &n)); // no hex
     BOOST_CHECK(!ParseUInt8(STRING_WITH_EMBEDDED_NULL_CHAR, &n));
     // Overflow and underflow
     BOOST_CHECK(!ParseUInt8("-255", &n));
@@ -1549,7 +1547,6 @@ BOOST_AUTO_TEST_CASE(test_ParseUInt16)
     BOOST_CHECK(!ParseUInt16("1a", &n));
     BOOST_CHECK(!ParseUInt16("aap", &n));
     BOOST_CHECK(!ParseUInt16("0x1", &n)); // no hex
-    BOOST_CHECK(!ParseUInt16("0x1", &n)); // no hex
     BOOST_CHECK(!ParseUInt16(STRING_WITH_EMBEDDED_NULL_CHAR, &n));
     // Overflow and underflow
     BOOST_CHECK(!ParseUInt16("-65535", &n));
@@ -1587,7 +1584,6 @@ BOOST_AUTO_TEST_CASE(test_ParseUInt32)
     BOOST_CHECK(!ParseUInt32("1a", &n));
     BOOST_CHECK(!ParseUInt32("aap", &n));
     BOOST_CHECK(!ParseUInt32("0x1", &n)); // no hex
-    BOOST_CHECK(!ParseUInt32("0x1", &n)); // no hex
     BOOST_CHECK(!ParseUInt32(STRING_WITH_EMBEDDED_NULL_CHAR, &n));
     // Overflow and underflow
     BOOST_CHECK(!ParseUInt32("-2147483648", &n));